[ANNOUNCE] Shared Topic Branch For ABI Changes

[ANNOUNCE] Shared Topic Branch For ABI Changes

[Leon Romanovsky]

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Hi,

Following the discussions at OFVWG (4/19/2016), I want to present
shared repository and topic branch for ABI change proposed patches.

Please post them on linux-rdma mailing list with clear indication that
it is supposed for ABI related work.

I would like to suggest to use [PATCH ABI xxx] notation, so it will be
easy for me to take them and don't mix with general RDMA development.

Kernel part git address:
 * git://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git
 * https://git.kernel.org/cgit/linux/kernel/git/leon/linux-rdma.git/

Branch name:
 * topic/abi

The supplementary user space (libibverbs) repository will be set a
little bit later.

Thanks

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Re: [ANNOUNCE] Shared Topic Branch For ABI Changes

[Jason Gunthorpe]

On Wed, Apr 20, 2016 at 08:52:21AM +0300, Leon Romanovsky wrote:

> The supplementary user space (libibverbs) repository will be set a
> little bit later.

We should also re-consider the idea that has been floated a few times
over the years:

 Combine all the RMDA plumbing libraries into one git repository.

This is librdmacm, libibverbs, libucm, libumad, libmad,
libmlx4/5/mtcha/ipath/cxgb/etc/etc

With the scope of the planned work this would seem essential to me.

Jason
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Re: [ANNOUNCE] Shared Topic Branch For ABI Changes

[Leon Romanovsky]

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On Wed, Apr 20, 2016 at 08:52:21AM +0300, Leon Romanovsky wrote:
> Hi,
> 
> Following the discussions at OFVWG (4/19/2016), I want to present
> shared repository and topic branch for ABI change proposed patches.
> 
> Please post them on linux-rdma mailing list with clear indication that
> it is supposed for ABI related work.
> 
> I would like to suggest to use [PATCH ABI xxx] notation, so it will be
> easy for me to take them and don't mix with general RDMA development.
> 
> Kernel part git address:
>  * git://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git
>  * https://git.kernel.org/cgit/linux/kernel/git/leon/linux-rdma.git/
> 
> Branch name:
>  * topic/abi
> 
> The supplementary user space (libibverbs) repository will be set a
> little bit later.

Libibverbs:
 * git://git.kernel.org/pub/scm/libs/leon/libibverbs.git
 * https://git.kernel.org/cgit/libs/leon/libibverbs.git/

Branch name:
 * topic/abi

> 
> Thanks



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Re: [ANNOUNCE] Shared Topic Branch For ABI Changes

[Leon Romanovsky]

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On Wed, Apr 20, 2016 at 09:29:24AM -0600, Jason Gunthorpe wrote:
> On Wed, Apr 20, 2016 at 08:52:21AM +0300, Leon Romanovsky wrote:
> 
> > The supplementary user space (libibverbs) repository will be set a
> > little bit later.
> 
> We should also re-consider the idea that has been floated a few times
> over the years:
> 
>  Combine all the RMDA plumbing libraries into one git repository.
> 
> This is librdmacm, libibverbs, libucm, libumad, libmad,
> libmlx4/5/mtcha/ipath/cxgb/etc/etc

Can you point me to relevant discussion?

Thanks.

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Re: [ANNOUNCE] Shared Topic Branch For ABI Changes

[Jason Gunthorpe]

On Thu, Apr 21, 2016 at 09:58:47AM +0300, Leon Romanovsky wrote:
> On Wed, Apr 20, 2016 at 09:29:24AM -0600, Jason Gunthorpe wrote:
> > On Wed, Apr 20, 2016 at 08:52:21AM +0300, Leon Romanovsky wrote:
> > 
> > > The supplementary user space (libibverbs) repository will be set a
> > > little bit later.
> > 
> > We should also re-consider the idea that has been floated a few times
> > over the years:
> > 
> >  Combine all the RMDA plumbing libraries into one git repository.
> > 
> > This is librdmacm, libibverbs, libucm, libumad, libmad,
> > libmlx4/5/mtcha/ipath/cxgb/etc/etc
> 
> Can you point me to relevant discussion?

I couldn't find it in the archive quickly. Doug, myself and Steve Wise
were talking about it after Doug started.

Doug was ambivalent, Steve was against. There was a concern the natual
release schedual of the parts was different, so why link them.

My counter was that isn't really important, the goal is is to reduce
developer time when working on this mess.

Since we are looking at changing *everything* developer time seems
more important right now.

Jason
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RE: [ANNOUNCE] Shared Topic Branch For ABI Changes

[Hefty, Sean]

> Doug was ambivalent, Steve was against. There was a concern the natual
> release schedual of the parts was different, so why link them.
> 
> My counter was that isn't really important, the goal is is to reduce
> developer time when working on this mess.
> 
> Since we are looking at changing *everything* developer time seems
> more important right now.

FWIW, I moved the librdmacm and libibacm into a single guthub project.  Even if we don't share a single git tree, this enables multiple maintainers for the code.  I would really like to see libibcm dropped entirely, and think libibverbs and librdmacm should merge.

In the past I would have been in favor of more closely associating libibumad with libibverbs, but now that OPA uses IB-like management, I'm not so sure.  I think OPA management could be done outside of any verbs emulation.  Ira might know for sure.

- Sean
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Re: [ANNOUNCE] Shared Topic Branch For ABI Changes

[Jason Gunthorpe]

On Thu, Apr 21, 2016 at 06:17:18PM +0000, Hefty, Sean wrote:
> > Doug was ambivalent, Steve was against. There was a concern the natual
> > release schedual of the parts was different, so why link them.
> > 
> > My counter was that isn't really important, the goal is is to reduce
> > developer time when working on this mess.
> > 
> > Since we are looking at changing *everything* developer time seems
> > more important right now.
> 
> FWIW, I moved the librdmacm and libibacm into a single guthub
> project.  Even if we don't share a single git tree, this enables
> multiple maintainers for the code.  I would really like to see
> libibcm dropped entirely, and think libibverbs and librdmacm should
> merge.

+1

> In the past I would have been in favor of more closely associating
> libibumad with libibverbs, but now that OPA uses IB-like management,
> I'm not so sure.  I think OPA management could be done outside of
> any verbs emulation.  Ira might know for sure.

IIRC OPA still uses /dev/umad. I suspect libmad/umad needs to grow new
structures and constants primarily.

I would call the combined repo 'rdma-plumbing' or something, intended
to cover the user space side for all the kernel interfaces.

I saw libfabric was having success with this model - is that accurate?

Jason
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RE: [ANNOUNCE] Shared Topic Branch For ABI Changes

[Hefty, Sean]

> I would call the combined repo 'rdma-plumbing' or something, intended
> to cover the user space side for all the kernel interfaces.
> 
> I saw libfabric was having success with this model - is that accurate?

Libfabric integrated the provider code directly into the same repo.  I would say that that model is working well.  It's allowing greater code sharing and makes it much easier to test multiple providers.  So I would say there's significant benefits for merging.
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